Improvement in draftsman s ruling-gages



UNITED STATES PATENT OEEICEi AUGUSTUS F. NAGLE, OF PROVIDENCE, RHODEISLAND.`

IMPROVEMENT IN DRAFTSMANS RULING-GAGES.

Specification forming part of Letters Patent No 139,601, dated J une 3,1873; application `filed March 27, 187 3.

To all whom it may concern:

Be it known that I, AUGUSTUS F. NAGLE, of the city and county-ofProvidence, in the State of Rhode Island, have invented a certain newand useful Hatching-Gage for draftsmens use.

i mounted upon the rule that it does not interfere with the straightline on one edge, whereby thatedge of the gage may be placed in contactwith the edge of the arm of a T-square, or other similar implement, andthe opposite edge of the 'gage properly 'made to engage l with atriangle, and thereby facilitate the operation of hatching,77 or drawingaccurately spaced and truly parallel lines at any desired angle; and Ido hereby declare that thefollowin g specilication, taken in connectionwith the drawings furnished and forming a part of the same, is a clearand true description of my invention.

Referring to the drawings, Figures l and 2 represent, in perspective,hatching-gages embodying my invention. Figs 3 and 4 represent the samerespectively in cross-section at line a b. Fig. 5 "represents one of myhatchin g-gages arranged in proper relation with a T-square,drawing-board, triangle, and a drawing in which hatching is embodied. j

A denotes in each instance the hatchingrule. It is essential that thetwo edges be straight and truly parallel. As represented in Figs. 1 and3, both edges are longitudinally grooved. Ou one edge, the portion onone side ofthe groove is recessed or set back from the other, while onthe opposite edge the two sides of the groove are iiush. In Figs. 2 and4 the edges are not grooved at all, butin lieu thereof a longitudinalopen slot extends nearly from end to end. On the face of the rule ameasuring-scale may or may not be provided. As illustrated in Figs 2 and4, one edge of the rule may be'rabbeted. B, in each instance, denotes astationary lateral projection or shoulder on one edge ofthe rule, nearits end.

In the rule shown in Fig. 3 the projection is wholly beyond the edge ofthe rule. In Fig. 4 the recessed shoulder is arranged to perform thesame function. O denotes a longitudinally-adjustable slide.` In Figs. 1and Sit is ina-de to embrace one side of the rule, laps over the edges,and engages with the grooves in both edges. On one side it is providedwith a laterally-projecting finger, d, which corresponds in generalcharacter with the finger B. Ou the back edge of the rule it is so cutaway above the groove that the edge surface of the metal of which theslide is made is brought wholly within the lineuofthe edge. A set-screw,e, is titted to engage with the rule and firmly set the slide at anydesired position. j

In` Figs. 2 and 4 the slide is fitted to the longitudinal slot in therule, and is adjustable therein by means of a set-screw, in a mannerwell known. Numerous methods can be adopted for attaching the slide tothe rule. It is only essential that rone straight edge shall remainunaected by the presence of the slide, and that it be capable of lixedadjustment longitudinally on the slide, and have a lateral projection orshoulder. When the recessed shoulder and the rabbeted edges are employedthe triangle may be rabbeted to correspond, so that either the rule ortriangle can be moved without interfering with each other.

The method of using my hatching-gage will be readily comprehended onexaminingy the sketch, Fig. 5. The drawing is represented as ,if on theboard; the T-square is in position; the hatching-gage and triangle areproperly adjusted. It will be seen that the base, or one side of thetriangle, is embraced between the projecting lingers B and d, and that aspace between the lower edge of the triangle and the nger ou the slidecorresponds with the width of" the threads of the screw which is beingdrawn on the paper. It is to be understood that a hatchingline hasalready been drawn by the upper inclined edge of the triangle, and thatanother is to be drawn. The gage is held firmly ou the paper, and thetriangle is then moved down until in contact withthe finger on theslide, after which the nextline is drawn then the gage is moved downuntil the ringer B is in Contact with the upper edge of the triangle,which is then again moved down, as before, when the next line can bedrawn, and so on, with accurate rapidity als long as the parallel linesare required. It will be seen that the spaces between the lines aredetermined by the space between the lower or upper edge of the triangleand the ngers.

Having thus described my invention7 I claim as new and desire to secureby Letters Patent- The combination of the rule with alongitudinally-adjustable slide fitted thereto, so as not to obstruct oraffect the straight line on one edge, and the lateral projections orshoulders, substantially as and for the purposes specified.

AUGUSTUS F. NAGLE.

Witnesses:

GHAs. H. HEROE, E. B. WESTON.

